I just had a battle where both my opponent and I had our dinos out with no buffs or debuffs on either one. When I held an attack button it showed the health bar of the opponent drop to zero, but it did not actually take the dino down. In fact, it left a little over 500 health.

My monomimus out against a trag. I’m not sure if:

The health preview was inaccurate
The armor wasn’t accounted for
Or if I didn’t do 1.5 damage on my nullifying impact.